红外测温原理及误差分析

Principle and Error Analysis of Infra-Red Temperature Measurement

从黑体辐射原理出发分析了红外测温的工作原理,推导了它的数学模型,描述了物体的辐射功率与波长、温度之间的关系,即红外测温必须根据实际测温范围,选择不同的工作波长.通过具体应用电路的实验数据,从环境、反射率、距离系数等几个方面,探讨和分析了测量精度的原因,得出了环境温度与被测目标温度之间的相互关系,验证了环境温度是红外测温产生误差的主要因素,并为消除测量误差提出了改进方法.

In this paper, the theory and mathematic model of infrared temperature measurement was established according to the principle of blackbody radiation. This paper described the relationship between power, wavelength and temperature of the object, that is, the infrared temperature measurement must match the different work wavelengths in response to the temperature. We analyzed the main factors for measurement accuracy, such as environment, reflectance and distance coefficient. Then we obtained the interrelationship between the ambient temperature and object temperature from an application circuit and its experiment data. We also proved that the main reason for infrared temperature measurement errors was ambient temperature. And finally, an improved method for the elimination of measurement errors was proposed.